In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.
Q: Question: Were the Patzinaks allied with the Rus? Passage:The fact that Byzantium in its dealings with the barbarians generally preferred diplomacy to war is not surprising. For the East Romans, faced with the ever-present necessity of having to battle on two fronts — in the east against Persians, Arabs and Turks, in the north against the Slavs and the steppe nomads — knew from personal experience how expensive war is both in money and manpower. The Byzantines were skilled at using diplomacy as a weapon of war. If the Bulgars threatened, subsidies could be given to the Kiev Rus. A Rus threat could be countered by subsidies to the Patzinaks. If the Patzinaks proved troublesome, the Cumans or Uzès could be contacted. There was always someone to the enemy’s rear in a position to appreciate the emperor's largesse. Another innovative principle of Byzantine diplomacy was effective interference in the internal affairs of other states. In 1282, Michael VIII sponsored a revolt in Sicily against Charles of Anjou called the Sicilian Vespers. Emperor Heraclius once intercepted a message from Persian rival Khosrau II which ordered the execution of a general. Heraclius added 400 names to the message and diverted the messenger, provoking a rebellion by those on the list. The emperor maintained a stable of pretenders to almost every foreign throne. These could be given funds and released to wreak havoc if their homeland threatened attack.
 Links: a. Pechenegs b. Pechenegs c. Kievan Rus' d. Kievan Rus'
A: 
a